The Edwards
5545M Hazardous Location Adaptatone Remote Speaker/Amplifier has been
designed for high decibel system operation when connected to the 5540M
Central Tone Generator or 5541M System Master Panel. See Adaptatone
Tone Generator.

Each
Speaker/Amplifier operates directly from local power sources, making it
possible in a single system to connect the remote Speaker/Amplifiers to
local power sources of different voltages. The unit mounts on any
surface using three bolts. See Adaptatone Signaling System Installation.